Anderson's classification statistic based on a post-stratified training sample

The performance of Anderson's classification statistic based on a post-stratified random sample is examined. It is assumed that the training sample is a random sample from a stratified population consisting of two strata with unknown stratum weights. The sample is first segregated into the two strata by post-stratification. The unknown parameters for each of the two populations are then estimated and used in the construction of the plug-in discriminant. Under this procedure, it is shown that additional estimation of the stratum weight will not seriously affect the performance of Anderson's classification statistic. Furthermore, our discriminant enjoys a much higher efficiency than the procedure based on an unclassified sample from a mixture of normals investigated by Ganesalingam and McLachlan (1978).     

小麦杂种优势利用研究的现状与对策

综述了目前我国小麦杂种优势利用研究的现状。指出小麦的杂种优势现象是普遍的、明显的和有利用价值的。目前我国在“三系”、“两系”和化杀方面都进行了较深入的研究 ,取得了一定的成果 ,但离实际应用还存在一定差距 ,今后的研究重点应放在“两系”的利用和化杀药剂的研制和利用方面     

“思想政治课教学论”教学必须引导学生做好两个转化

本文认为 ,教好“思想政治课教学论”这门课 ,必须引导学生做好两个转化 :一是将大学的专业知识转化到中学的思想政治课教学内容中 ;二是将大学所学的教学方法转化为适应中学教学的教学技能     

论语文课堂教学的调控艺术

课堂调控艺术反映着语文教师教学艺术的整体水平 ,直接影响语文教学的质量和效率。本文结合教学实际探讨了调控课堂教学氛围、课堂教学节奏和课堂意外情况的具体途径和方法     

末态粒子相空间二维自仿射分形

在二维相空间对高能强子 -强子碰撞末态粒子的阶乘矩进行了研究 ,验证了高能粒子碰撞末态粒子相空间二维自仿射分形的性质 ,测定了其分形指数     

On tail-ordering and comparison of failure rates

In this paper, we have studied some implications between tail-ordering (also known as dispersive ordering) and failure rate ordering (also called TP₂ ordering) of two probability distribution functions. Based on independent random samples from these distributions, a class of distribution-free tests has been proposed for testing the null hypothesis that the two life distributions are identical against the alternative that one failure rate is uniformly smaller than the other. The tests have good efficiencies as compared to their competitors.     

开展综合素质测评,全面提高学生素质

:文章总结了浙江大学医学院学生综合素质测评工作。即采用自我、班级、系、院四级管理体制 ,勤检查、核对、修正 ,增强测评工作的透明度 ,公平合理、真实地反映学生的综合素质情况。实践证明 ,这项工作是全面提高学生综合素质的有效手段     

试论邓小平“一国两制”思想与台湾问题的关系

邓小平“一国两制”构想作为实现祖国统一的既定方针 ,已成功解决香港、澳门问题 ,也必将促成台湾问题的最终解决。“一国两制”关于台湾问题的基本内容提出后 ,“蒋、李时期”台湾当局对之作出了不同反应 ,李登辉最近提出的“两国论”实质是“台独论” ,使两岸关系呈现出一些新的特点 ,也带来了一些新的思考     

Some sampling effects of pairwise correlated observations on likelihood ratio tests for the difference between two means

We study the effects of the inclusion of pairs of correlated observations in a sample on likelihood ratio tests for the difference in two means. In particular, we assess how the inclusion of correlated data pairs (e.g., such as data inadvertently collected from sib-pairs) affects the sample size requirements necessary for the implementation of a Likelihood Ratio (LR) test for the difference between two means. Our results suggest that correlated data pairs beneficially or adversely effect sample size requirements for an LR test to a degree functionally related to the mixture parameters dictating their relative frequencies in the larger sample on which the test will be performed, the strength of the correlation between the observations, and the size of imbalances in the sample with respect to the number of observations in each group. The relevance and implications of the results for genetic and epidemiologic research are discussed.     

朝鲜半岛北南关系对中国的影响及应对

自天安号事件至今,异常紧张的朝鲜半岛北南关系暂时告一段落,逐渐由军事博弈转移到外交博弈上来。近期半岛北南关系大幅度缓和可能性不大,但有缓和迹象,可谓冲突与缓和契机并存。倘若半岛北南双方再次发生冲突就会对中国造成一定影响。本文主要分析去年以来半岛北南紧张关系升级及对中国造成的影响,并提出相应的应对措施。